Ventilator



Patented Nov. 27, 1923.

` UNITED STATES4 y JAMES-K. ROBINSON, OF LITTLE ROCK, ARKANSAS.

VENTILATOR.

yAppncatio filed August 23, 1922. serial No. 583,8-27. i

To all whom t may concern Be it Aknown that I, JAMES K. ROBINSON, a citizen of the United States, residing at Little Rock, in the county of Pulaski and State of Arkansas, have .invented certain new and useful Improvements in Ventilators, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in ventilators, and more particularly to that type of ventilator employed for removing f from the rooms and hallways of buildings foul and heated air.

. An important object of the invention 1s to provide an improved construction of that type of ventilator illustrated in my Patent No. 1,076,451, granted under date of October 21, 1913, for improvements in ventilators. In the said patent I have illustrated a ventilator embodying a cowl rotatably mounted upon a draft member, and means coacting with the draftl member and carried by the cowl for directing and defiecting wind so that a partial vacuum is formed in the draft n,

member to cause eduction of air in the building to which the ventilator. is applied. While the construction illustrated in this patent has been found in practice to be practical and operative, it has been' found that the same does not operate with the desired efliciency underlight winds, and an important object of this invention-accordingly becomes the construction of a ventilator which,

' when operating under light winds, will cause a partial evacuation of the draft member to will become apparent throughout the courseof the following description.' Y.

In the accompanying drawings wherein for the purpose of illustration is-shown a preferred embodiment of my invention and wherein like reference characters designateV like parts throughout A A v Figure 1 is a vertical sectional'view'taken through a ventilatorconstructed in accordance with. my invention;

Figure 2 is a sectionon the line 2 2 of Flgure l;

Figure 3 is a section on the line 3-3 of Figure l; and A v Figure 4 isa detail viewv showing the manne of mounting the bearings for the pivot I'O Referring now more particularly to the drawings, the numeral 10 indicates a draft member, adapted at its lower end for engagement with a pipe 11 leading from the space to be ventilated, and the numeral 12 a cowl having the usual fin 13 forV directing the eduction mouth of the lcowl to leeward. Mounted within the draft member 10 adjacent the lower endthereof is a cross bar 14 haring its ends bent at right angles and secured to the wall of the draft member. VUpon the upper surface of this cross bar adjacent the ends thereof are mounted the ends of a yoke 15, the central portion of which is vertically spaced from the cross bar 14 and provided with an opening 16 axially aligned with the draft member 10. At its upper end the draft member 10 is'provided with a second cross bar 17 having an opening therein aligned with the opening 16 of the yoke 15. This cross bar is preferably arranged at right angles to the cross bar 14 for a purpose presently to appear. c

Mounted upon the cross bar 14 in alignment with the yoke opening 16 is a bearing plate 18 preferably formed of glass and held in position upon the cross barby means of a binding strap 19 surrounding the bearing and the cross bar 14.V This binding strap is preferably of greater width than the bearingplate 18 and has struck in portionsv 20 maintaining the bearing plate 18 in position.

hemisphere extends through the openings of I the cross bar and yoke and abuts againt the upper surface of the bearing plate.

Secured to the innersurface of the cowl at that portion thereof forming the angle of v the cowl and hereinafterreferred to asthe angular section 23 of the cowl is a member 24 formed from a single sheet of strapironbent at one end toform vspaced attaching v portions 25 connected by la horizontal portion 26 and avertically extendingportiony 27 extending upwardly from the end ofl the horizontal portion. The opposite end of the member 24 is bent out to form a horizontal.

section 28 in spaced relation to the hori- Zontal section 26, and the extremity bent upwardly and engaged with the under surface of the uppermost attaching portion 25 and being connected thereto. The horizontal portion 28 forms a guide and has an opening therein axial to the vertical portion of the cowl, yand the horizontal portion. 26 forms a bearing rest and has a bearing similar to the bearing carried by the cross bar 14. Secured to the member 24 is a transversely extending bracing bar^29 of any suitable construction, the ends of which are extended to the sides of the cowl and secured thereto. The Lipper' end of the pivot rod 22 is provided with a hemisplierical head, such as previously described, which extends through 'the opening of the horizontal portion or guide 28 and engages against the bearing'carried by the guide rest 26. A. cross bar 30 has its endssecured tothe cowl and extends abovethe upper end of theV draft member l0, this cross bar having an opening formed therein through which the pivot rod 22 yis directed.

The lower end of the cowl l2 is provided with a frustro-conical flange ,31. Secured to Vand extending downwardly from the lower face of the frustro-conical rflange at the sides of the windward portion thereof are varies 32, the inner ends of which extend inwardly beyond the central opening ofthe" flange and are secured to the side flanges 33 of anv arcuate plate 34. The lower edge of this arcuate plate is secured to the inner edge opening of a second frustro-conical flange 33 disposed below and in spaced relation to the frustro-conical flange 31 but concentric therewith, and they plate extends upwardly from the flange 3G in spaced Vrenlation tothe wall of the cowl l2 and has its flanges 33 secured to the lower frustro-conical flange 36, and the vanes, plate, cowl and anges co-act to form a fresh air duct 35` directed upwardly and terminating approximately level with the upper end yof the draft member l0 and having an intake duct 37 i Ywhich is directed to windward by the normalV action of the vcowl l2 under the influence of the wind.

in the operation of my device, vthe wind Vhaving directed the eduction mouth of the cowl to leeward and the induction conduit 37 to the Windward, a portion of the wind Y entering in theA induction mouth 37 and passing upwardly through the fresh air duct 35 ,sweeps upwardly through the cowl, causing a suction at the upper end of the draft inember i0 and partially evacuating the same,

- thereby speeding `up vthe movement of the foulair passing from the roomior building through the draft member'lO. While the corresponding to the vanes 32 and theflower '80. to the fact that the yarrangement of the braces or cross bars bly-means of which the` pivot rod maintains the cowl` and4 draft. member in the proper spaced relation and` frustro-conical flange. Attention is directed supports the cowl for pivotal `movement is such that transverse movement or wobblingl of the cowl is effectually prevented, thereby,

preventing in a largemeasure the unpleasant noises accompanying the operation. of these.

ventilators.

lt will be noted'from an inspection of the drawings that thatvportion ofthe 'frustrokf conical flanges 3l and 36 lyingv to the lee! ward of the vanes 32 perform nofunction. This portion of the flanges may accordingly the purpose of giving the ventilator a balel anced appearance in its construction.

From the foregoing it is'believed to `be obe vious that a ventilator constructed in accordance with my invention will be efficient in Tg5- be omitted if desired, being only'retained :foriv that the arrangement is such that eduction losses during light winds is avoided and sE for the further reason that the construction.y of the same is such that the vdevice .willzb'e very durable in service. lt vwill furthermore be obvious that the construction as hereinbefore set forth is capableof some change and modification without materially dep`arting from the spirit'of my invention and accordingly do notlimit-myself to such specific structure except as hereinafter."

claimed.

l claim i. A ventilator comprising'a draft .mem-

ber, a cowl y revolubly 'mountedupon and surrounding the upper end of'rsaid draft member and provided atjits lower end with spaced frustro-conical flanges, a fresh air'.

duct carried bythecowl upon theiinterio'r thereof and terminating in approximate alignment with the upper end of the draft member,'aiid vanes connecting said fr-ustroconical flanges and forming Aan induction` port communicating with said fresh airY duct, said induction portbeing direc-ted'to jut.

Windward by the normal -operationof sai'd cowl, the inner wallof said' fresh airfduct paralleling the wall" of said draftimemb'erinspaced relation thereto.

2. In a ventilator, a draft member, a cowl revolubly mounted upon and surrounding the upper end of said draft member, an arcuate plate disposed interorly of the cowl member and provided at its side edges with flanges extending toward and secured to the wall of the cowl, the lower` end of said plate extending beneath the lower end of the cowl and having secured thereto a downwardly and outwardly extending flange, a downwardly and outwardly extending ange secured to the lower end of the cowl, and

venes connecting said flange members and combinlng therewlth to for-m an lnduction.

port, said plate combining with said cowl to 16 the opposite side thereof 'from said fresh air I0 duct from said arcuate plate.r

In testimony whereof I hereunto affix my signature.

' JAMES K. ROBINSON. 

